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image guidance in radiation oncology treatment planning: the role of imaging technologies on the planning process

1 Radiation therapy is used for cancer

2 state of art : intensity modulated radiation therapy (IMRT) and image guided radiation therapy (IGRT)

Both of them enable the radiation oncologists to sculpt a 3D dose cloud around the target volume.

IGRT further incorporates with some in-room correction systems. These systems ensure the treatment beam hits the target volume although the motion could occur. 'I guess, in general, it is only some breath motion gating systems'

3 for radiation therapy, target delineation is the crucial input data to the treatment planning process. such that the correction imaging modalities are needed. e.g. 4d ct, 4d pet/ct, mri.